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19/05/2025 14:30
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Dr Julien MASBOU (SUBATECH)19/05/2025 14:45
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Claudia De dominicis19/05/2025 15:15
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Kristjan Muursepp (NICPB, Tallinn and LNF-INFN, Frascati)19/05/2025 16:15Dark Universe
In this talk I will discuss particle physics scenarios connecting baryogenesis with first order phase transition. In particular, I will focus on the scenario wherein the CP violation required for baryogenesis is produced by the collision of true vacuum bubbles. I will elaborate both on the case where the right handed neutrino responsible for lepton number violation is produced on-shell as well...
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Margaux JOMAIN (LAPTh)19/05/2025 16:45Dark Universe
Thermal Dark Matter (DM) below the GeV scale faces strong cosmological and astrophysical constraints, with Cosmic Microwave Background (CMB) observations excluding s-wave annihilation cross-sections for thermal DM below 10 GeV. Such limits can be evaded with velocity dependent cross-sections, for example when DM annihilates near a narrow resonance. In this work, we explore the impact of...
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19/05/2025 17:30
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Leo Constantin (LPSC)20/05/2025 09:30
After LHC Run 2, a large variety of searches is able to constrain supersymmetric models. ATLAS recently presented a summary of constraints from their Run 2 analysis sensitive to electroweak-inos on a scan of the phenomenological minimal supersymmetric standard model (pMSSM). Using the SModelS reinterpretation tool, we present our results for this pMSSM scan and compare our constraints with...
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Adrian Darricau (LPCA)20/05/2025 10:00
We address the phenomenological impact of a well-motivated class of scotogenic models regarding electroweak precision observables.
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In particular, we carry out a full computation of the next-to-leading order corrections to leptonic Higgs and Z-boson decays. We argue how
the current bounds (and future prospects) for the latter observables, together with constraints arising from lepton flavour... -
Axel Iohner (LAPTh)20/05/2025 11:00
We analyze publicly available $K^+ \to \pi^+ \nu \bar{\nu}$ data collected by NA62 from 2016 to 2022 to constrain the fundamental vectorial coupling of the QCD axion to the down and strange quarks or, equivalently, the Peccei-Quinn scale $f_a$ rescaled by this coupling, obtaining $|(F_{V})_{23}| > 1.1 \times 10^{12}~\mathrm{GeV}$. Under the complementary assumption that axion production is...
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Mael Cavan (Lapth / USMB)20/05/2025 11:30
We consider an axion flux on Earth consistent with emission from the Supernova explosion SN 1987A. Using Chiral Perturbation Theory augmented with an axion, we calculate the energy spectrum of $a+N\to N+\gamma$ as well as $a+N\to N+\pi^0$, where $N$ denotes a nucleon in a water tank, such as the one planned for the Hyper-Kamiokande neutrino detection facility. Our calculations assume the most...
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Thomas Wojtkowski20/05/2025 12:00
This talk will present the recent search for emerging jets performed using LHC Run 3 data collected with the ATLAS detector.
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This analysis considers the production of a pair of dark quarks undergoing showering and hadronization within a dark sector, forming long-lived dark mesons that decay back to Standard Model particles. The resulting signature is a pair of jets, each one associated to... -
Andre Lessa20/05/2025 14:00Methods and Tools
We present the complete one-loop matching of the Minimal Supersymmetric Standard Model (MSSM) onto the Standard Model Effective Field Theory (SMEFT), considering the most general case for the MSSM with conserved R-parity, which has 124 free parameters. The matching is performed with the MATCHETE package, integrating out all superpartners at once with non-degenerate masses. We validate against...
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Suraj Prakash - (IFIC (Universitat de Valencia - CSIC))20/05/2025 14:20Methods and Tools
In recent years, significant progress has been made in the development of automated tools that match the parameters of new physics models and the Wilson coefficients of appropriate low-energy Effective Field Theories. This talk will shed light on an extensible, hybrid tool OperatorToC++, that combines the strengths of Mathematica and C++ to facilitate the next steps beyond the matching....
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Henning Bahl (Universität Heidelberg)20/05/2025 14:40
In the precision era of particle physics, accurate theoretical predictions and utilizing the full experimental information are key for advancing our understanding of fundamental physics. In my talk, I will show how machine learning can help us to achieve both in a controlled manner including well-calibrated uncertainties.
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Nathan Huetsch (Heidelberg University)20/05/2025 16:00Methods and Tools
Machine learning enables unbinned, highly-differential cross section measurements. A recent idea uses generative models to morph the measured distribution into the unfolded distribution. We show how to extend two morphing techniques, Schrödinger Bridges and Direct Diffusion, in order to ensure that the models learn the correct conditional probabilities. This brings distribution mapping to a...
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Sofia Palacios Schweitzer (ITP, Heidelberg University)20/05/2025 16:20Methods and Tools
Many physics analyses at the LHC rely on algorithms to remove detector effect, commonly known as unfolding. Whereas classical methods only work with binned, one-dimensional data, Machine Learning promises to overcome both problems. Using a generative unfolding pipeline, we show how it can be build into an existing LHC analysis, designed to measure the top mass. We discuss the model-dependence...
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Jonas Spinner (Heidelberg University)20/05/2025 16:40Methods and Tools
We show that the Lorentz-Equivariant Geometric Algebra Transformer (L-GATr) yields state-of-the-art performance for a wide range of machine learning tasks at the Large Hadron Collider. L-GATr represents data in a geometric algebra over space-time and is equivariant under Lorentz transformations. The underlying architecture is a versatile and scalable transformer, which is able to break...
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Nikita Schmal (ITP, Heidelberg University)20/05/2025 17:00Methods and Tools
Global SMEFT analyses combine a vast range of LHC measurements to construct likelihoods to put constraints on physics beyond the Standard Model. However, constructing and evaluating profile likelihoods for such analyses is computationally intensive and prone to instability and noise. We show how modern numerical techniques, similar to neural importance sampling, can dramatically enhance both...
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Thomas Guérandel (LPSC)21/05/2025 09:15Higgs
Keeping the gauge symmetry manifest in the two-Higgs doublet model (THDM)
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has turned out to be very powerful. Stability, electroweak-symmetry breaking, basis transformations, and general symmetries can be studied concisely in terms of gauge-invariant bilinears for any THDM Higgs potential. Recently, the formalism has been extended to the complete model, including the gauge and Yukawa sectors,... -
Matthias Tartarin (L2I Toulouse, Université de Toulouse, CNRS/IN2P3)21/05/2025 09:40Higgs
One of the LHC's priorities, following the discovery of the Higgs boson, is to observe the production of Higgs pairs and to measure the Higgs tri-linear coupling $\lambda_{3H}$.
Due to the rarity of di-Higgs production, measuring $\lambda_{3H}$ has proven to be highly challenging. Exclusion limits have been observed using a variety of approaches, including cut-based methods and boosted...
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Roman Poeschl (IJCLab)21/05/2025 10:05
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Mathieu Markovitch (IJCLab)21/05/2025 11:00
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Nihal Brahimi (LAPP)21/05/2025 11:25Higgs
The production of a top–antitop quark pair in association with a W boson (${t\bar{t}}W$) is a dominant background in several measurements of rare processes, such as $t\bar{t}H$ and four-top ($t\bar{t}t\bar{t}$) production, as well as in searches for physics beyond the Standard Model. The precision, accuracy, and modeling of the ${t\bar{t}}W$ process represent a major limitation in the...
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Aliaksei Kachanovich (Université libre de Bruxelles)21/05/2025 11:50Higgs
In the study of the rare $H \to Z \gamma$ process, both ATLAS and CMS collaborations reported an excess with $\mu = 2.2 \pm 0.7$ in the number of events. Initially, this was interpreted as a modification of the $HZ\gamma$ vertex. However, the $H \to Z \gamma$ process is reconstructed from the $H \to \ell \ell \gamma$ final state, and background contributions were previously neglected. In this...
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21/05/2025 12:15
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